CN217972802U

CN217972802U - Pure two water machines of no waste water

Info

Publication number: CN217972802U
Application number: CN202222262402.1U
Authority: CN
Inventors: 廖恒路
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2022-12-06
Anticipated expiration: 2032-08-26

Abstract

The utility model relates to the technical field of double water machines, in particular to a pure double water machine without waste water, wherein a raw water pipeline is sequentially communicated with a circulating cylinder, a first filter cylinder, a booster pump, a second filter cylinder, a third filter cylinder, a fourth filter cylinder and a water storage tank through pipelines; the pipeline at the water outlet of the third filter cylinder is divided into three paths, and one path is communicated with the water inlet of the fourth filter cylinder; one path is communicated with a water return pipeline, and the water return pipeline is communicated to a water inlet of the circulating cylinder; one path is communicated with a water purifying pipeline; an RO reverse osmosis membrane filter element is arranged in the fourth filter cylinder, a pipeline on the water production side of the fourth filter cylinder is divided into two paths, one path is communicated with the water storage tank, a first electromagnetic valve is arranged on a communicating pipeline, and the other path is communicated with a water return pipeline; the fourth filter cylinder is divided into two paths of pipelines at the concentrated water side, one path is communicated to the water outlet of the circulating cylinder through a pressure relief pipeline, and the other path is communicated with a water return pipeline. The utility model discloses initial quality of water is relatively poor after can avoiding the start of pure two water machines, and can intensive mixing backward flow concentrated water and raw water, filter effect are good.

Description

Pure two water machine of no waste water

Technical Field

The utility model relates to a pure two water machine technical field especially relates to a pure two water machines of no waste water.

Background

The purified water machine has the functions of both a water purifier and a water purifier, and allows a family user to have more choices, wherein the purified water is produced water after being filtered by an ultrafiltration membrane, and the purified water is produced water after being filtered by an RO reverse osmosis membrane. The RO reverse osmosis membrane is used for water treatment by utilizing the reverse osmosis principle, water molecules can pass through the RO reverse osmosis membrane under certain pressure, and impurities such as inorganic salt, heavy metal ions, organic matters, colloid, bacteria, viruses and the like in water cannot permeate through the RO membrane, so that part of water is separated out through the RO membrane to be called pure water, and the water which does not permeate through the RO membrane is called concentrated water due to the increase of solute.

The existing pure double water machine has the functions of realizing no wastewater discharge by the backflow of concentrated water of the RO reverse osmosis membrane and washing the RO reverse osmosis membrane filter element by utilizing pure water; however, the prior art double-water machine has the following problems: 1. when the existing double-water machine produces pure water, concentrated water flows back, but the returned concentrated water is not fully mixed with the raw water in the raw water pipeline, so that the phenomenon of uneven mixing exists; 2. after the two water machines stopped operating, the thick water end of RO reverse osmosis membrane remained there is thick water, and remaining thick water can lead to RO reverse osmosis membrane TDS value too high (TDS is the dissoluble solid total amount, indicates calcium magnesium ion, suspended particulate matter, protein, microorganism in the aquatic), has the relatively poor condition of initial quality of water when the two water machines of pure water reuse.

Therefore, in view of the problems of the prior art, a need exists in the art for a new type of dual water purifier without waste water.

Disclosure of Invention

The utility model aims to solve the technical problem that a pure two water machines of no waste water is provided, can avoid the initial quality of water of pure two water machines relatively poor, and can intensive mixing backward flow concentrated water and raw water, filter effect are good.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a wastewater-free purified double water machine comprises a circulating cylinder, a first filter cylinder, a second filter cylinder, a third filter cylinder, a fourth filter cylinder and a booster pump; the raw water pipeline is sequentially communicated with the circulating cylinder, the first filter cylinder, the booster pump, the second filter cylinder, the third filter cylinder, the fourth filter cylinder and the water storage tank through pipelines; the water outlet pipeline of the third filter cylinder is divided into three paths, and one path is communicated with the water inlet of the fourth filter cylinder; one path is communicated with a water return pipeline, a first flow limiting valve is arranged on the communicating pipeline, and the water return pipeline is communicated to a water inlet of the circulating cylinder; one path is communicated with a water purification pipeline, a first high-pressure switch is arranged on the water purification pipeline, and a water purification faucet is arranged at the outlet end of the water purification pipeline; an RO reverse osmosis membrane filter element is arranged in the fourth filter cylinder, a pipeline on the water production side of the fourth filter cylinder is divided into two paths, one path is communicated with the water storage tank, a first electromagnetic valve is arranged on a communicating pipeline, and the other path is communicated with the water return pipeline; the fourth filter cylinder concentrated water side pipeline is divided into two paths, one path is communicated to the water outlet of the circulating cylinder through a pressure relief pipeline, and the other path is communicated with the water return pipeline; and a second flow limiting valve is installed on the water return pipeline, and a second electromagnetic valve is installed on the pressure relief pipeline.

The utility model has the advantages that: raw water of a raw water pipeline is fully and uniformly mixed with the backflow concentrated water and the redundant purified water through a circulating cylinder; the first high-voltage switch power supply of the water purification pipeline is connected with a booster pump control circuit in series, when the water purification faucet is opened, the booster pump is powered by the first high-voltage switch, when the water purification faucet is closed, the booster pump stops working, a water purification outlet is divided into three paths, one path of water is discharged through the water purification faucet, the other path of water enters the fourth filter cylinder, and is discharged through a pressure relief pipeline to flush the RO membrane after the booster pump stops working, and the other path of water controls redundant water to flow back into the circulation cylinder through a return pipeline through a first flow limiting valve; a first electromagnetic valve is arranged between the water production side of the fourth filter cylinder and the water storage tank, when the pure double water machine is restarted, the microcomputer board controls the first electromagnetic valve to be closed for a period of time, and at the moment, the RO reverse osmosis membrane water production and the concentrated water of the fourth filter cylinder both flow back into the circulating cylinder through the water return pipeline, so that the RO reverse osmosis membrane is washed, the TDS remained in the fourth filter cylinder is clear, and the quality of the pure water effluent is effectively ensured; when the booster pump starts to work, the normally open second electromagnetic valve of the pressure relief pipeline is electrified and closed, the pressure of the RO reverse osmosis membrane concentrated water side is kept, after the booster pump stops working, the normally open second electromagnetic valve is powered off and opened, and at the moment, the concentrated water remained in the fourth filter cylinder is subjected to pressure relief and backflow through the pressure relief pipeline and washes the RO reverse osmosis membrane; the function of the second flow limiting valve on the water return pipeline is to adjust the proportion of pure water on the water production side and pure water on the water inlet side of the fourth filter cylinder, when the booster pump works, the pure water has certain pressure and is filtered by the reverse osmosis membrane to generate pure water, when the set pressure of the second flow limiting valve is increased, the pressure of the pure water on the water inlet side of the fourth filter cylinder is increased, the water yield of the pure water is increased, when the set pressure of the second flow limiting valve is reduced, the backflow amount of the pure water after being filtered is increased, the water yield of the pure water is increased on the premise of ensuring the quality of the pure water by setting a proper pressure value, and the pure water is utilized to the maximum extent.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, a third electromagnetic valve is installed on a water inlet pipeline of the circulating cylinder, a second high-voltage switch is installed on a water outlet pipeline of the circulating cylinder, and the second high-voltage switch and the third electromagnetic valve are interlocked.

The adoption of the further scheme has the beneficial effects that the pressure in the circulating cylinder is controlled to be overhigh by combining the normally-open second high-voltage switch and the normally-open third electromagnetic valve, when the pressure is greater than a set value, the normally-open high-voltage switch is electrified for the normally-open electromagnetic valve, and the normally-open electromagnetic valve is disconnected to prevent raw water from entering the circulating cylinder so as to achieve the purpose of reducing the pressure.

Furthermore, a first pressure reducing valve is further installed on the water inlet pipeline of the circulating cylinder, and a second pressure reducing valve and a low-pressure switch are further installed on the water outlet pipeline of the circulating cylinder.

The beneficial effect of adopting the further scheme is that: the first pressure reducing valve is used for controlling the over-high water inlet pressure of the raw water pipeline, the control pressure is 0.25-0.4MPa, and the first pressure reducing valve has the function of eliminating water hammer phenomenon and protecting each part; when the pressure in the first circulating cylinder exceeds the set pressure, the second pressure reducing valve works to control pressure reduction, and the control pressure is 0.25-0.4MPa; the low-voltage switch is used for automatically cutting off the power supply when the water pressure of raw water is too low or water is cut off, so that the self-priming booster pump stops working, and the self-priming booster pump is prevented from being damaged due to too low water pressure or no water.

Further, the water outlet of the circulating cylinder is communicated with a domestic water pipeline, and a domestic water faucet is installed at the outlet end of the domestic water pipeline.

The beneficial effect of adopting the further scheme is that: the water obtained by fully mixing the raw water and the backflow concentrated water is discharged through the domestic water pipeline and the domestic faucet, so that the concentrated water is fully utilized.

Furthermore, a circulating pipe is arranged in the circulating cylinder; a carbon fiber mixing filter element is arranged in the first filter cylinder; an ion exchange filter element is arranged in the second filter cylinder; and an ultrafiltration membrane filter element is arranged in the third filter cylinder.

The beneficial effect of adopting the above further scheme is: the circulating pipe is used for mixing and circulating the backflow concentrated water and the raw water, and the circulating pipe improves the uniform mixing degree of the concentrated water and the high-concentration water and prolongs the mixing time; the carbon fiber mixing filter element is used for filtering silt, rust, algae, red worms and the like and adsorbing chemical substances in water; the ion exchange filter element exchanges calcium and magnesium ions in water by using an ion exchange principle; the ultrafiltration membrane filter element is used for filtering solid impurities, suspended matters, colloidal bacteria and other impurities in water to generate purified water.

Furthermore, the water purification pipeline, the return water pipeline, the pressure relief pipeline, the third filter cylinder water outlet and the communicating pipeline between the return water pipeline, the fourth filter cylinder water outlet and the communicating pipeline between the return water pipeline are all provided with check valves.

The beneficial effect of adopting the further scheme is that: the check valve ensures the unidirectional flow of water; the check valve is arranged on the water purification pipeline and cooperates with the first high-pressure switch, when the water purification faucet is closed, the check valve prevents the purified water from flowing back, a certain pressure in the water purification pipeline is maintained, the first high-pressure switch is guaranteed to be powered off, and the booster pump is controlled to stop working.

Further, the pipe diameters of the pipelines of the raw water pipeline sequentially communicated with the circulating cylinder, the first filter cylinder, the booster pump, the second filter cylinder, the third filter cylinder, the fourth filter cylinder and the water storage tank are gradually reduced.

The beneficial effect of adopting the further scheme is that: set up each pipeline into different pipe diameters, the raw water pipeline pipe diameter is the biggest, and outlet conduit pipe diameter is minimum, is favorable to carrying out multistage filtration and more effectual washing RO reverse osmosis membrane to the raw water.

Furthermore, an electronic floating ball is installed in the water storage tank.

The beneficial effect of adopting the further scheme is that: when the water storage tank is full of water, the electronic floating ball controls the booster pump to stop working; when the water level in the water storage tank is lower than a set value, the electronic floating ball controls the booster pump to work to store water into the water storage tank.

Via the above technical scheme, compare with prior art, the beneficial effects of the utility model are that:

(1) When the utility model is used when the pure double water machine is started, the first electromagnetic valve is closed for a period of time, and the water produced by the fourth filter cylinder and the concentrated water all flow back into the circulating cylinder through the return pipeline, so as to clean the inside of the fourth filter cylinder and the reverse osmosis membrane, reduce the TDS value and ensure the quality of the pure water subsequently stored in the water storage tank; when the booster pump works, the second electromagnetic valve of the pressure relief pipeline is closed, and the pressure of the concentrated water end is maintained; after the first electromagnetic valve is opened, pure water filtered by the RO membrane flows to the water storage tank, pure water with certain pressure filtered by the pure water enters the backflow pipeline through the second flow limiting valve, the proportion of the pure water and the pure water is controlled through the second flow limiting valve, when the booster pump stops working, the second electromagnetic valve is opened, and the residual concentrated water in the fourth filter cylinder is decompressed and flows back through the pressure relief pipeline;

(2) The utility model improves the mixing degree of the backflow concentrated water and the raw water and prolongs the mixing time through the circulation tube mixing circulation in the circulation cylinder, and the normally open electromagnetic valve of the water inlet pipeline of the circulation cylinder and the normally open high-voltage switch interlock control of the water outlet pipeline thereof avoid the overhigh pressure in the circulation cylinder;

(3) The water produced by the third filter cylinder of the utility model is divided into three paths, one path is discharged through the water purification pipeline, the first high-voltage switch of the water purification pipeline is connected with the booster pump control circuit in series, when the water purification tap is opened, the first high-voltage switch controls the booster pump to be electrified and work, when the water purification tap is closed, the check valve avoids backflow, and the first high-voltage switch controls the booster pump to stop in time; one path of the water enters the fourth filter cylinder, is decompressed and reflows through a decompression pipeline after the booster pump stops working, and washes a reverse osmosis membrane; one path controls the redundant clean water of the third filter cylinder to flow back to the circulating cylinder through the return line by the second flow-limiting valve.

Drawings

Fig. 1 is the schematic view of the connection structure of the wastewater-free pure dual-water machine of the utility model.

In the drawings, the components represented by the respective reference numerals are listed below:

1-a raw water pipeline; 2-a circulation cylinder; 3-a first filter cartridge; 4-a booster pump; 5-a second filter cartridge; 6-a third filter cartridge; 7-a fourth cartridge; 8, a water storage tank; 9-water purification faucet; 10-living water tap; 11-a first pressure relief valve; 12-a third solenoid valve; 13-a second high voltage switch; 14-a second pressure relief valve; 15-low voltage switch; 16-a first flow restriction valve; 17-a first solenoid valve; 18-a second flow restriction valve; 19-a second solenoid valve; 20-a check valve; 21-a first high voltage switch; 101-a clean water pipeline; 102-a water return pipeline; 103-a pressure relief pipeline; 104-domestic water line.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, the embodiment of the present invention discloses a pure dual-water machine without waste water, which comprises a circulation cylinder 2, a first filter cylinder 3, a second filter cylinder 5, a third filter cylinder 6, a fourth filter cylinder 7 and a booster pump 4; the raw water pipeline 1 is sequentially communicated with a circulating cylinder 2, a first filter cylinder 3, a booster pump 4, a second filter cylinder 5, a third filter cylinder 6, a fourth filter cylinder 7 and a water storage tank 8 through pipelines; the water outlet pipeline of the third filter cylinder 6 is divided into three paths, and one path is communicated with the water inlet of the fourth filter cylinder 7; one path is communicated with a water return pipeline 102, a first flow limiting valve 16 is arranged on the communicating pipeline, and the water return pipeline 102 is communicated to a water inlet of the circulating cylinder 2; one path is communicated with a water purifying pipeline 101, a first high-pressure switch 21 is arranged on the water purifying pipeline 101, and a water purifying faucet 9 is arranged at the outlet end of the water purifying pipeline; an RO reverse osmosis membrane filter element is arranged in the fourth filter cartridge 7, a pipeline on the water production side of the fourth filter cartridge is divided into two paths, one path is communicated with the water storage tank 8, a first electromagnetic valve 17 is arranged on a communicating pipeline, and the other path is communicated with the water return pipeline 102; the pipeline on the concentrated water side of the fourth filter cylinder 7 is divided into two paths, one path is communicated to the water outlet of the circulating cylinder 2 through a pressure relief pipeline 103, and the other path is communicated with a water return pipeline 102; the water return pipeline 102 is provided with a second flow limiting valve 18, and the pressure relief pipeline 103 is provided with a second electromagnetic valve 19. The booster pump 4 is a self-absorption booster pump; the first high voltage switch 21 is connected in series with the booster pump 4 control line.

In order to further optimize the technical scheme, a third electromagnetic valve 12 is installed on a water inlet pipeline of the circulating cylinder 2, a second high-voltage switch 13 is installed on a water outlet pipeline of the circulating cylinder, and the second high-voltage switch 13 is interlocked with the third electromagnetic valve 12. The second high-voltage switch 13 is a normally open high-voltage switch, and the third electromagnetic valve 12 is a normally open electromagnetic valve.

In order to further optimize the technical scheme, a first pressure reducing valve 11 is further installed on a water inlet pipeline of the circulating cylinder 2, and a second pressure reducing valve 14 and a low-pressure switch 15 are further installed on a water outlet pipeline of the circulating cylinder. The control pressure of the first pressure reducing valve 11 and the second pressure reducing valve 14 is 0.25MPa-0.4MPa.

In order to further optimize the technical scheme, the water outlet of the circulating cylinder 2 is communicated with a domestic water pipeline 104, and a domestic water tap 10 is installed at the outlet end of the domestic water pipeline 104.

In order to further optimize the technical scheme, a circulating pipe is arranged in the circulating cylinder 2; a carbon fiber mixing filter element is arranged in the first filter cylinder 3; an ion exchange filter element is arranged in the second filter cylinder 5; and an ultrafiltration membrane filter element is arranged in the third filter cylinder 6.

In order to further optimize the technical scheme, check valves 20 are respectively arranged on a communicating pipeline between the water purifying pipeline 101, the water return pipeline 102, the pressure relief pipeline 103, the water outlet of the third filter cartridge 6 and the water return pipeline 102, and the communicating pipeline between the water outlet of the fourth filter cartridge 7 and the water return pipeline 102.

In order to further optimize the technical scheme, the pipe diameters of pipelines of the raw water pipeline 1, which are sequentially communicated with the circulating cylinder 2, the first filter cylinder 3, the booster pump 4, the second filter cylinder 5, the third filter cylinder 6, the fourth filter cylinder 7 and the water storage tank 8, are gradually reduced.

In order to further optimize the technical scheme, an electronic floating ball is installed in the water storage tank 8.

When the utility model is used, the raw water in the raw water pipeline 1 sequentially passes through the circulating tube 2, the first filter cartridge 3, the carbon fiber mixed filter element, the booster pump 4, the second filter cartridge 5, the ion exchange filter element and the fourth filter cartridge 6 ultrafiltration membrane filter element under the self pressure or the booster pump 4 by self-absorption, and the purified water is further stored in the water storage tank 8 after passing through the RO reverse osmosis membrane filter element of the fifth filter cartridge 7;

after the machine is started, the microcomputer board controls the first electromagnetic valve 17 to be closed for 3 to 5 minutes, the water producing side and the concentrated water side of the fifth-stage filter cylinder 7 both flow back to the water inlet of the circulating cylinder 2 through the return pipeline 102, and the interior of the fifth-stage filter cylinder 7 and the RO reverse osmosis membrane are cleaned; after the cleaning is finished, the first electromagnetic valve 17 is opened, and pure water at the water production side of the fifth-stage filtration enters the water storage tank 8 for storage; when the booster pump 4 works, the second electromagnetic valve 19 is closed, and the concentrated water after purified water filtration of the fifth-stage filter cylinder 7 has certain pressure and enters the return pipeline 102 through the second flow limiting valve 18 to return to the circulation cylinder 2; when the water storage tank 8 is full of water, the electronic floating ball controls the booster pump 4 to stop working, the second electromagnetic valve 19 is opened at the moment, the residual concentrated water in the fifth-stage filter cylinder 7 is decompressed and flows back to the water outlet of the circulating cylinder 2 through the decompression pipeline 103, and the RO reverse osmosis membrane is flushed;

when the purified water faucet 9 is opened, the pressure of the purified water pipeline 101 is reduced, the first high-pressure switch 21 is electrified to control the booster pump 4 to work, the purified water filtered by the third filter cartridge 6 is divided into three paths, and one path is discharged through the purified water pipeline 101 and the purified water faucet 9; one path enters the fourth filter cylinder 7, the second electromagnetic valve 19 is closed at the moment, and the purified water is low in pressure and is not filtered by the RO reverse osmosis membrane; one path controls redundant pure water to flow back into the water return pipeline 102 through the first flow limiting valve 16; when the purified water faucet 9 is closed, the check valve 20 of the purified water pipeline 101 prevents the purified water from flowing back, the pressure of the purified water pipeline 101 rises, the first high-pressure switch 21 is powered off to control the booster pump 4 to stop working, the second electromagnetic valve 19 is opened at the moment, the purified water reserved in the fourth filter cartridge 7 is discharged through the pressure relief pipeline 103, and the RO reverse osmosis membrane is flushed in the discharging process;

the concentrated water filtered by the fourth filter cartridge 7 and the redundant purified water in the third filter cartridge 6 flow back to the water inlet of the circulating cylinder 2 through the water return pipeline 102, and the raw water and the backflow concentrated water are fully mixed and diluted through the circulating pipe; the normally open third electromagnetic valve 12 of the water inlet pipeline of the circulating cylinder 2 and the second high-pressure switch 13 of the water outlet pipeline thereof are interlocked, when the pressure in the circulating cylinder 2 exceeds a set value, the second high-pressure switch 13 controls the third electromagnetic valve 12 to be powered on and off to stop raw water from entering; and a second reducing valve 14 of a water outlet pipeline of the circulating cylinder 2 works to reduce pressure, and the control pressure is 0.25MPa-0.4MPa.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. A wastewater-free purified double water machine is characterized by comprising a circulating cylinder (2), a first filter cylinder (3), a second filter cylinder (5), a third filter cylinder (6), a fourth filter cylinder (7) and a booster pump (4); the raw water pipeline (1) is sequentially communicated with the circulating cylinder (2), the first filter cylinder (3), the booster pump (4), the second filter cylinder (5), the third filter cylinder (6), the fourth filter cylinder (7) and a water storage tank (8) through pipelines;

the water outlet pipeline of the third filter cylinder (6) is divided into three paths, and one path is communicated with the water inlet of the fourth filter cylinder (7); one path is communicated with a water return pipeline (102), a first flow limiting valve (16) is arranged on the communicating pipeline, and the water return pipeline (102) is communicated to a water inlet of the circulating cylinder (2); one path is communicated with a water purification pipeline (101), a first high-pressure switch (21) is installed on the water purification pipeline (101), and a water purification faucet (9) is installed at the outlet end of the water purification pipeline;

an RO reverse osmosis membrane filter element is arranged in the fourth filter cylinder (7), a pipeline at the water production side of the fourth filter cylinder is divided into two paths, one path is communicated with the water storage tank (8), a first electromagnetic valve (17) is arranged on a communicating pipeline, and the other path is communicated with the water return pipeline (102); the concentrated water side pipeline of the fourth filter cylinder (7) is divided into two paths, one path is communicated to the water outlet of the circulating cylinder (2) through a pressure relief pipeline (103), and the other path is communicated with the water return pipeline (102); and a second flow limiting valve (18) is installed on the water return pipeline (102), and a second electromagnetic valve (19) is installed on the pressure relief pipeline (103).

2. The pure dual-water machine without wastewater as claimed in claim 1, characterized in that a third electromagnetic valve (12) is installed on the water inlet pipeline of the circulation cylinder (2), and a second high-voltage switch (13) is installed on the water outlet pipeline thereof, wherein the second high-voltage switch (13) and the third electromagnetic valve (12) are interlocked.

3. The pure dual-water machine without waste water as claimed in claim 2, characterized in that the water inlet pipeline of the circulation cylinder (2) is further provided with a first pressure reducing valve (11), and the water outlet pipeline thereof is further provided with a second pressure reducing valve (14) and a low pressure switch (15).

4. The pure dual-water machine without wastewater as claimed in claim 3, characterized in that the water outlet of the circulation cylinder (2) is communicated with a domestic water pipeline (104), and a domestic water tap (10) is installed at the outlet end of the domestic water pipeline (104).

5. The pure dual-water machine without wastewater as claimed in claim 1, characterized in that a circulation pipe is installed inside the circulation cylinder (2); a carbon fiber mixing filter element is arranged in the first filter cylinder (3); an ion exchange filter element is arranged in the second filter cylinder (5); and an ultrafiltration membrane filter element is arranged in the third filter cylinder (6).

6. The pure dual-purpose water machine without wastewater as claimed in claim 1, wherein the purified water pipeline (101), the return water pipeline (102), the pressure relief pipeline (103), a communication pipeline between the water outlet of the third filter cartridge (6) and the return water pipeline (102), and a communication pipeline between the water producing side of the fourth filter cartridge (7) and the return water pipeline (102) are all provided with check valves (20).

7. The dual water purifier without wastewater purification as claimed in claim 1, wherein the pipe diameters of the pipelines of the raw water pipeline (1) sequentially communicated with the circulation cylinder (2), the first filter cylinder (3), the booster pump (4), the second filter cylinder (5), the third filter cylinder (6), the fourth filter cylinder (7) and the water storage tank (8) are gradually reduced.

8. The dual water machine without wastewater purification according to any of claims 1 to 7, characterized in that the water storage tank (8) is internally provided with an electronic floating ball.